Safety-valve



(No Model.)

C. M. SIEIELDRAKI;v Y

SAFETY VALVE. v

No. 578,046. Patented Mar. 2, 1897.

A UNITED STATES PATENT OFFICE.

CHARLES M. SHELDRAKE, OF PHILADELPHTA, PENNSYLVANIA.

SAFETY-VALVE.

SPECIFICATION forming part of Letters Patent No. 578,046, dated March 2,1897.

Application filed October 24, 1895.

To all whom it may concern,.-

- Be it known that I, CHARLES lvLSHELDRAKE, a citizen of the UnitedStates, residing in the city and county of Philadelphia, State ofPennsylvania, have invented a new and useful Improvement inSafety-Valves, which improvement is fully set forth in the followingspeciv fication and accompanying drawings.

My invention consists of a'novel construction of safety-valve in whichthe stuffing-box is dispensed with and provision is made for causing aquick movement of the valve by means of a Weight which is movable upon asuitable guideway or track above said valve after the same has beenopened to a slight extent, said valve being employed as a safetyvalvewherever such are used.

It further consists of novel details of construction, all as will behereinafter set forth.

Figure l represents aside elevation, partly in section, of an automaticlever-valve embodying my invention,` the valve being shown in closedposition. Fig. 2 represents a side elevation, partly in section, of thesame valve shown in open position. Fig. 3 represents a modiiied form ofweight employed in which the friction is reduced to a minimum. Fig. 4represents a section on line wat, Fig. 5. Fig. 5 represents an end viewof Fig. 4.

Similar letters of reference indicate corresponding parts in the severalfigures. A

Referring to the drawings, A designates a valve-casing, the same beingprovided with a base portion B, to which is attached the upright post orstandard C.

D designates a valve-seat within said casing, and E a passage extendingto the exterior of the said casing above said seat.

G designates a cap mounted on said casing A, through which thevalve-stem H passes, the lower extremity of the latter within saidcasing being provided with the pistons or valves J and .K and the saidcasing having an inlet F in its base.v 4

L designates a packing-ring or washer attached to the under side of saidpiston-K, the upper side of the piston J having a similar packing-ringor Washer M attached thereto, said packing-ring or washer M beingadapted to contact with the under portion of the cap G when the valve isopen.

N designates a lever which is fulcrumed at Serial No'. 566,746. (Nomodel.)

P to the upper portion of the standard C, said lever having a slot Rtherein through which passes the pin or stud Q, the latter being securedto the upper portion of said stem H. n

S and T designate upright members extending from said rod N to the upperextremities of said members, being joined by the rod or bar Il, uponwhich latter the weight V is adapted to slide' or ride over the centerof said stem, said weight being round, square, or other desired shape,as is evident.

'W designates a slot in the upper portion of the upright S, throughwhich passes a screw X, by means of which the contacting portions of therods or bars'S and U are adjusted in the desired position.

Y and Z designate eyes which are attached to the bars or rods S andU'and T and N at their junctions, respectively.

The fulcrum P and the pivotal stud Q are so located and the height ofthe valve-stem H is such that when the valve K is on the seat D thelever N is in substantially horizontal position, as seen in Fig. l, andthat the upright member T is longer than the member S and nearer to thestandard C andvalvestem H than said latter-mentioned member.

The operation is as follows: .When the pressure entering the inlet Fincreases above the norm al,the valve-pistons J and K are elevated fromthe position seen in Fig. l into the position seen in Fig. 2, and thesurplus or extraordinary pressure will escape through the outlet E, itbeing noted that when the piston .J is in its highest position thepacking M contacts with the under side of the cap G, forming a tightjoint therewith, so that no leakage can take place at this point,thereby rendering the employment of a stuffing-boX-unnecessary. When thevalve starts to move to its upper position from the position seen inFig. l, the instant that the rod U passes from the horizontal position,so as to incline downwardly fromleft to right, the ball V will start toroll toward the right into the position seen in Fig. 2, whereby it willbe evident that a greatly-accelerated movement will be given to thevalve by reason of the mounting of the weight V in the manner described,a simil'ar downward accelerated movement taking place the instant thatthe rod or bar U begins to incline downwardly from the right to the IOOleft, or, in other Words, from the position seen in Fig. 2 to theposition seen in Fig. l.

It will be apparent that when the upward pressure on the valve isreduced so that its Weight will overcome that of the Weight V, and sofall, and the bar U is tilted so that it inclines in the oppositedirection from that shown in Fig. 2 the Weight V Will rapidly resume theposition seen in Fig. l, thereby seating the valve. In Fig. 3 I haveshown a Weight A', provided with a pulley or roller B', which isjournaled in a recess in said weight, said roller being movable on therod U in substantially the same manner as the Weight V moves.

In Figs. et and I have'shown avveight C', which is cut out, as indicatedin Fig. 5, and is connected by means of the studs or rods D', upon whichthe rollers or pulleys E are mounted, the relative position of saidWeight with respect to the rod U being apparent from said figures, itbeing evident that said Weight travels only one-half as far as theWeight A' or V during the movement of the valve.`

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

l. In an automatic lever-valve, a casing having a valve-seat, anoutlet-passage therein above said seat, a valve adapted to contact withsaid seat and having a valve-stem attached thereto, the inlet to saidcasing being through said seat and said valve being adapted to be raisedby the pressure of the incoming fluid, a standard adjacent said casing,a bar fulerumed on said standard, means for causing said bar andvalve-stem to move in unison, uprights of unequal length attached tosaid bar, a rod connecting said uprights, and a sliding Weight movableupon said rod, substantially las described.

2. In an automatic lever-valve, a casing havingaseat therein, anoutlet-passage above said seat, a valve adapted to contact with saidseat having avalve-stem attached thereto, the inlet of said easing beingthrough said seat, and said valve being adapted to be raised by thepressure of the incoming fluid, said valve having a plurality ofpistons, the upper piston being provided with packing on its upper side,and its lower piston having packing on its lower side, a packingless capfor said casing, a standard adjacent said casing, a bar fulcrumed onsaid standard, a pin common to said bar and valve-stem, uprights ofunequal length attached to said valve-stem, a rod connecting saiduprights, and a Weight movable upon said rod, substantially asdescribed.

3. In an automatic lever-valve, a casing with an inlet in its base, andan outlet in its side, a valve-seat in which said inlet-passage islocated, a post located adjacent said casing,

a valve in the latter, a cap on said casing, a

stem for said valve movable in said cap, a bar fulcrumed on said post,and having a slot therein, a pin common to said bar and stem, uprightsof unequal length mounted on said bar, the longer upright being nearerto said post, a rod joining said uprights, and a Weight movable on saidrod, substantially as described.

4. In an automatic lever-valve, a casing A, post C, the pistons J and K,having the packings L and M on their upper and lower sides respectively,the valve-stem II, the bar N, fulcrumed in said post C, and having aslot therein,'a pin Q com mon to said slot and stem, the members S andT, an adjustable bar U and a Weight V movable thereon substant all y asdescribed.

5. In an automatic lever-valve, a casing having a valve-seat, anoutlet-passage therein above said seat, a valve adapted to contact withsaid seat and having a valve-stem attached thereto, the inlet to saidcasing being through said seat, and said valve being adapted to beraised by the pressure of the incoming iuid, a standard adjacent saidcasing, a bar fulcrumed lon said standard, a pin comlnon to said bar andvalve-stem, uprights of unequal length attached tosaid bar, a rodconnecting said uprights, and a recessed Weight having a rollerjournaled therein, said roller being adapted to contact with said rod,substantially as described.

CHARLES M. SHELDRAKE.

Witnesses:

JOHN A. WIEnERsHnn/r, E. H. FAIRBANKS.

